COLEOPTERA 549 



scutellum to the hind margin: these Hnes are very nearly contiguous, and if they were 

 flattened out and more separated the suture would be imbricate. 



The antennae are widely separate, and the grooves behind them are broad and 

 indefinite, the outer pair especially are indistinct and are very strongly transverse in 

 direction. 



Labrum small, emarginate, the angle on the left side slightly more prominent than 

 the other angle. Mandibles elongate, the basal part of each with three or four teeth, the 

 indentation between the basal two teeth filled by a delicate membrane. Terminal joint 

 of labial and of maxillary palpi very short and slender compared with the others. 

 INiiddle coxae verj- distant, the mesosternum with rather lilunt termination between 

 them. 



(i) Lcjirocoryniis ccphalotcs, sp. nov. 



Niger, subdepressus, paljiis pedibusque interdum rufescentibus; nitidus, elytris 

 subopacis; capite fortiter irregulariter punctato, thorace punctis perpaucis irregulariter 

 notato, elytris punctis sat numerosis plus minusve obsoletis. Long. 1 1 — 25 mm. 



Plate X\T. fig. 22. 



Extremely variable in size; and the larger specimens have usually more ]>unctuation 

 on the head, while that on the elytra is more effaced. In correlation with the difference 

 of size there are distinctions in the shape of the specimens, the smallest individuals being 

 nearly parallel, while the largest have the abdomen very broad, the lateral margins being 

 remarkably wide. The species seems most at home in the island of Kauai, and it is 

 there that the largest examples occur. I have not noticed any sexual distinctions. 



Hab. Kauai, Molokai, Lanai, Hawaii. — Kauai, 4000 ft. vi. 1894; mts. Waimea, 

 4000 ft. v. 1894; Koholuamano, 4000 ft. iv. 1895. — Maui, Haleakala, 4500 ft. iv. 1894. 

 — -Molokai, 4000 ft. 27. v. 1893. — Lanai, 3000 ft. vi. 1S94, 2000 ft. i. 1894. — Hawaii, 

 Hualalai, ix. 1900. — (Perkins.) 



Xanthocorvnus, gen. nov. 



Palpi articulo ultimo parvo. 



Caput sulcis, praesertim intermediis, subobsoletis. 



Pronotum seriebus dorsalibus punctorum. 



Elytra sutura haud imbricata, singulo linea elevata sat discreta. 



The insect for which I establish this genus has entirely the facies of the more feeble 

 exponents of the genus Xantliolimts, so that I was very much surprised when I found 

 that it was quite distinct from that genus and that it is really closely allied to the other 

 two Hawaiian forms of the subfamily Xantholinini. 



It differs from Lairocoryiiits by so many minor points that I think in the Hawaiian 

 fauna it should be treated as a distinct genus, though the discovery of an intermediate 

 form may cause it to be merged in Lciirocorvniis. It is of narrow form, not flattened, 



